Jump from bowl to aquarium

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I have a betta that has been kept in a smaller bowl and due to winter I am going to upgrade to a larger ...

I have a betta that has been kept in a smaller bowl and due to winter I am going to upgrade to a larger 5 gallon tank. More specifically, I'm going to need to install a heater because my house is usually kept between 68-72 in the winter and it will be too cold for the fish.

So I have a two plants now. I think I will buy a couple more. Use ecocomplete substrate. I have this light:

What heater should I buy? I would like something that will keep the tank heated automatically without me having to monitor it constantly. I am not home enough for this. So it needs to be appropriate for a 5 gallon tank and it needs to be able to automatically read water temp and turn off and on reliably as necessary.